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Note 9 - Shareholders' Equity (Details Textual)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
Sep. 30, 2026
$ / shares
May 31, 2025
USD ($)
Dec. 31, 2024
$ / shares
shares
Jan. 31, 2021
USD ($)
Dec. 31, 2017
USD ($)
Common Stock, Shares Authorized (in shares)   500,000,000 500,000,000       500,000,000    
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares   $ 0.01 $ 0.01       $ 0.01    
Common Stock, Shares, Outstanding (in shares)   48,744,901 48,744,901       48,912,293    
Proceeds from Issuance of Common Stock | $     $ 43 $ 41          
Stock Repurchased During Period, Value | $   $ 1,832 $ 1,981            
Preferred Stock, Shares Authorized (in shares)   100,000,000 100,000,000       100,000,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares   $ 0.01 $ 0.01       $ 0.01    
Preferred Stock, Shares Issued (in shares)   4,800,000 4,800,000       4,800,000    
Preferred Stock, Shares Outstanding (in shares)   4,800,000 4,800,000       4,800,000    
Long-term Incentive Plan Units [Member] | Unit Distribution [Member]                  
Stock Issued During Period, Shares, Conversion of Units (in shares)     33,396            
Capital Units, Outstanding (in shares)   2,191,510 2,191,510            
Series A Redeemable Preferred Stock [Member]                  
Stock Issued During Period, Shares, New Issues (in shares) 4,800,000                
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares $ 0.01                
Preferred Stock, Dividend Rate, Percentage 6.625%                
Proceeds from Issuance of Preferred Stock and Preference Stock | $ $ 115,900                
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares $ 25                
Preferred Stock, Dividend Rate, Per-Dollar-Amount (in dollars per share) | $ / shares 1.65625                
Preferred Stock, Convertible, Conversion Ratio   3.701 3.701            
Preferred Stock, Shares Issued (in shares)   4,800,000 4,800,000            
Payments of Dividends | $     $ 2,000            
Preferred Stock, Shares Outstanding (in shares)   4,800,000 4,800,000            
Series A Redeemable Preferred Stock [Member] | Forecast [Member]                  
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares         $ 25        
Series A Redeemable Preferred Stock [Member] | Scenario, Change of Control [Member]                  
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ / shares $ 25                
Share Repurchase Program Authorized May 2025 [Member]                  
Share Repurchase Program, Authorized, Amount | $           $ 25,000      
Stock Repurchased During Period, Shares (in shares)   255,213 275,693            
Shares Acquired, Average Cost Per Share (in dollars per share) | $ / shares   $ 7.18 $ 7.17            
Stock Repurchased During Period, Value | $   $ 1,800 $ 2,000            
Share Repurchase Program, Remaining Authorized, Amount | $   23,000 23,000            
ATM Equity Offering Program [Member]                  
Equity Offering, Maximum Offering Amount | $   $ 77,500 $ 77,500         $ 100,000  
Stock Issued During Period, Shares, New Issues (in shares)   0 0            
Dividend Reinvestment and Stock Purchase Plan (DRSPP) [Member]                  
Equity Offering, Maximum Offering Amount | $   $ 49,900 $ 49,900           $ 50,000
Stock Issued During Period, Shares, New Issues (in shares)   2,118 5,842            
Stock Issued During Period, Weighted Average Price Per Share (in dollars per share) | $ / shares   $ 7.15 $ 7.29            
Proceeds from Issuance of Common Stock | $   $ 15 $ 43